os/modules/wireguard/ehex.nix

{
  lib,
  config,
  ...
}: let
  cfg = config.pub-solar.wireguard.ehex;
in {
  options.pub-solar.wireguard.ehex = {
    ownIPs = lib.mkOption {
      description = "Internal ips in wireguard used for cluster control-plane communication.";
      type = lib.types.listOf lib.types.str;
      default = [];
    };

    privateKeyFile = lib.mkOption {
      description = "Location of private key file";
      type = lib.types.path;
    };
  };

  config = lib.mkIf (lib.length cfg.ownIPs != 0) {
    networking.firewall.allowedUDPPorts = [51822];

    systemd.network.wait-online.ignoredInterfaces = ["wg-ehex"];

    systemd.services.wireguard-wg-ehex = import ./service-override.nix lib;

    networking.wireguard.interfaces = {
      wg-ehex = {
        listenPort = 51822;
        mtu = 1300;
        ips = cfg.ownIPs;
        privateKeyFile = cfg.privateKeyFile;
        postSetup = ''
          printf "nameserver 10.0.66.10\nnameserver 10.0.66.12" | resolvconf -a wg-ehex -m 0 -x
        '';
        postShutdown = ''
          resolvconf -d wg-ehex -f
        '';
        peers = [
          {
            endpoint = "vpn-gateway.ehex.de:4242";
            publicKey = "Fsg4KEyDEvQEt/1cVWU9xa/k9x/3UhONDj61aXZ7tys=";
            presharedKey = "tQy7B5R3wOgWwIKFDcEr4WZIqCrwG+9UgPRIQx/5xso=";
            allowedIPs = ["10.42.0.0/22" "10.0.66.0/24"];
            persistentKeepalive = 15;
            dynamicEndpointRefreshSeconds = 30;
          }
        ];
      };
    };
  };
}